llvm-project

de1d4baf - [Clang] Warn about ignored dllimport on explicit instantiations (#191392)

[Clang] Warn about ignored dllimport on explicit instantiations (#191392) Diagnose about a non-effective dllimport attribute on an explicit instantiation declaration for a specialization which was already (implicitly) instantiated somewhere, rather than ignoring it silently. related to #21132